Speaker: Daniel Asmus (Southampton U.)
From dusty tori to winds around accreting supermassive black holes -- an infrared observational perspective
I will briefly review our current understanding of the dust structures found around accreting supermassive black holes that observationally manifest as active galactic nuclei (AGN). Thanks to new infrared observations at the highest angular resolutions available, we now come to realise that the warm dust is not forming a rather static torus-like structure as so far assumed from the simplest versions of the AGN unification schemes but part of a polar outflow or wind that is probably radiation-driven. This dynamical structure seems to form a hollow cone extending from the dust sublimation radius up to hundreds of parsec and thus beyond the black hole sphere of influence into the realm of the host galaxy. Therefore, these dusty polar winds might provide the basis for the much sought-after AGN feedback. I will summarise the most recent observational results on this subject and new evidence that these winds might indeed be an ubiquitous structure of AGN able to retire the dusty torus scenario. I will conclude with the bright prospects for testing the new scenario with new and upcoming observational facilities.
Room: Sala de Reuniões e Seminários (2nd Floor of physics building)